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The diagonal is 26cm
length of diagonal of 20 of a 20 feet and 15 width.
diagonal lines can either increase or decrease height or width depending on their angle. If the diagonal line is closer to vertical it adds height and decreases width. If the diagonal line is closer to horizontal, it adds width and decreases height.
Length = (1/2 of perimeter) minus (Width) Diagonal = square root of [ (Length)2 + (Width)2 ]
Assuming you're talking about a rectangle: Diagonal squared = length squared + width squared (Pythagoras) so: Length squared = diagonal squared - width squared ie length = sqrt (diagonal squared - width squared)